treewide: drop adding hicolor-icon-theme where possible

This was either for the setup-hook to remove caches or added
even though the respective icon theme propagated it.

pkgs/applications/misc/orca/default.nix

@@ -1,7 +1,7 @@
 { stdenv, pkgconfig, fetchurl, buildPythonApplication
 , autoreconfHook, wrapGAppsHook, gobject-introspection
 , intltool, yelp-tools, itstool, libxmlxx3
-, python, pygobject3, gtk3, gnome3, substituteAll, hicolor-icon-theme
+, python, pygobject3, gtk3, gnome3, substituteAll
 , at-spi2-atk, at-spi2-core, pyatspi, dbus, dbus-python, pyxdg
 , xkbcomp, procps, lsof, coreutils, gsettings-desktop-schemas
 , speechd, brltty, liblouis, setproctitle, gst_all_1, gst-python
@@ -31,7 +31,6 @@ buildPythonApplication rec {
   nativeBuildInputs = [
     autoreconfHook wrapGAppsHook pkgconfig libxmlxx3
     intltool yelp-tools itstool gobject-introspection
-    hicolor-icon-theme # setup-hook
   ];
 
   propagatedBuildInputs = [